package com.imooc.sell.service.impl;

import com.imooc.sell.exception.SellException;
import com.imooc.sell.service.RedisLock;
import com.imooc.sell.service.SecKillService;
import com.imooc.sell.utils.UUIDUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.Map;
import java.util.HashMap;

/**
 * Describe:
 *
 * @Author 王艳军
 * @Date 2017/12/20 11:13:18
 */
@Service
public class SecKillServiceImpl implements SecKillService {

    private static final int TIMEOUT = 10 * 1000; //超时时间 10s

    @Autowired
    private RedisLock redisLock;

    /**
     * 国庆活动，皮蛋粥特价，限量100000份
     */
    static Map<String, Integer> products;
    static Map<String, Integer> stock;
    static Map<String, String> orders;
    static
    {
        /**
         * 模拟多个表，商品信息表，库存表，秒杀成功订单表
         */
        products = new HashMap<String, Integer>();
        stock = new HashMap<String, Integer>();
        orders = new HashMap<String, String>();
        products.put("123456", 100000);
        stock.put("123456", 100000);
    }

    private String queryMap(String productId)
    {
        return "国庆活动，皮蛋粥特价，限量份"
                + products.get(productId)
                +" 还剩：" + stock.get(productId)+" 份"
                +" 该商品成功下单用户数目："
                +  orders.size() +" 人" ;
    }

    @Override
    public String querySecKillProductInfo(String productId)
    {
        return this.queryMap(productId);
    }

    @Override
    public synchronized void orderProductMockDiffUser(String productId)
    {
        //加锁
        long time = System.currentTimeMillis() + TIMEOUT;
        if (!redisLock.lock(productId, String.valueOf(time))) {
          throw new SellException(101, "哎呦喂，人也太多了，换个姿势再试试~~~~~");
        }
        //1.查询该商品库存，为0则活动结束。
        int stockNum = stock.get(productId);
        if(stockNum == 0) {
            throw new SellException(100, "活动已经结束");
        } else {
            //2.下单(模拟不同用户openid不同)
            orders.put(UUIDUtil.gen32UUID(), productId);
            //3.减库存
            stockNum = stockNum - 1;
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            stock.put(productId,stockNum);
        }
        //解锁
        redisLock.unlock(productId, String.valueOf(time));
    }
}
